Fresh start

1 files changed, 767 insertions, 0 deletions

diff --git a/jni/ruby/ext/socket/basicsocket.c b/jni/ruby/ext/socket/basicsocket.c
new file mode 100644
index 0000000..5455977
--- /dev/null
+++ b/jni/ruby/ext/socket/basicsocket.c
@@ -0,0 +1,767 @@
+/************************************************
+
+  basicsocket.c -
+
+  created at: Thu Mar 31 12:21:29 JST 1994
+
+  Copyright (C) 1993-2007 Yukihiro Matsumoto
+
+************************************************/
+
+#include "rubysocket.h"
+
+/*
+ * call-seq:
+ *   BasicSocket.for_fd(fd) => basicsocket
+ *
+ * Returns a socket object which contains the file descriptor, _fd_.
+ *
+ *   # If invoked by inetd, STDIN/STDOUT/STDERR is a socket.
+ *   STDIN_SOCK = Socket.for_fd(STDIN.fileno)
+ *   p STDIN_SOCK.remote_address
+ *
+ */
+static VALUE
+bsock_s_for_fd(VALUE klass, VALUE fd)
+{
+    rb_io_t *fptr;
+    VALUE sock = rsock_init_sock(rb_obj_alloc(klass), NUM2INT(fd));
+
+    GetOpenFile(sock, fptr);
+
+    return sock;
+}
+
+/*
+ * call-seq:
+ *   basicsocket.shutdown([how]) => 0
+ *
+ * Calls shutdown(2) system call.
+ *
+ * s.shutdown(Socket::SHUT_RD) disallows further read.
+ *
+ * s.shutdown(Socket::SHUT_WR) disallows further write.
+ *
+ * s.shutdown(Socket::SHUT_RDWR) disallows further read and write.
+ *
+ * _how_ can be symbol or string:
+ * - :RD, :SHUT_RD, "RD" and "SHUT_RD" are accepted as Socket::SHUT_RD.
+ * - :WR, :SHUT_WR, "WR" and "SHUT_WR" are accepted as Socket::SHUT_WR.
+ * - :RDWR, :SHUT_RDWR, "RDWR" and "SHUT_RDWR" are accepted as Socket::SHUT_RDWR.
+ *
+ *   UNIXSocket.pair {|s1, s2|
+ *     s1.puts "ping"
+ *     s1.shutdown(:WR)
+ *     p s2.read          #=> "ping\n"
+ *     s2.puts "pong"
+ *     s2.close
+ *     p s1.read          #=> "pong\n"
+ *   }
+ *
+ */
+static VALUE
+bsock_shutdown(int argc, VALUE *argv, VALUE sock)
+{
+    VALUE howto;
+    int how;
+    rb_io_t *fptr;
+
+    rb_scan_args(argc, argv, "01", &howto);
+    if (howto == Qnil)
+	how = SHUT_RDWR;
+    else {
+	how = rsock_shutdown_how_arg(howto);
+        if (how != SHUT_WR && how != SHUT_RD && how != SHUT_RDWR) {
+	    rb_raise(rb_eArgError, "`how' should be either :SHUT_RD, :SHUT_WR, :SHUT_RDWR");
+	}
+    }
+    GetOpenFile(sock, fptr);
+    if (shutdown(fptr->fd, how) == -1)
+	rb_sys_fail("shutdown(2)");
+
+    return INT2FIX(0);
+}
+
+/*
+ * call-seq:
+ *   basicsocket.close_read => nil
+ *
+ * Disallows further read using shutdown system call.
+ *
+ *   s1, s2 = UNIXSocket.pair
+ *   s1.close_read
+ *   s2.puts #=> Broken pipe (Errno::EPIPE)
+ */
+static VALUE
+bsock_close_read(VALUE sock)
+{
+    rb_io_t *fptr;
+
+    GetOpenFile(sock, fptr);
+    shutdown(fptr->fd, 0);
+    if (!(fptr->mode & FMODE_WRITABLE)) {
+	return rb_io_close(sock);
+    }
+    fptr->mode &= ~FMODE_READABLE;
+
+    return Qnil;
+}
+
+/*
+ * call-seq:
+ *   basicsocket.close_write => nil
+ *
+ * Disallows further write using shutdown system call.
+ *
+ *   UNIXSocket.pair {|s1, s2|
+ *     s1.print "ping"
+ *     s1.close_write
+ *     p s2.read        #=> "ping"
+ *     s2.print "pong"
+ *     s2.close
+ *     p s1.read        #=> "pong"
+ *   }
+ */
+static VALUE
+bsock_close_write(VALUE sock)
+{
+    rb_io_t *fptr;
+
+    GetOpenFile(sock, fptr);
+    if (!(fptr->mode & FMODE_READABLE)) {
+	return rb_io_close(sock);
+    }
+    shutdown(fptr->fd, 1);
+    fptr->mode &= ~FMODE_WRITABLE;
+
+    return Qnil;
+}
+
+/*
+ * Document-method: setsockopt
+ * call-seq:
+ *   setsockopt(level, optname, optval)
+ *   setsockopt(socketoption)
+ *
+ * Sets a socket option. These are protocol and system specific, see your
+ * local system documentation for details.
+ *
+ * === Parameters
+ * * +level+ is an integer, usually one of the SOL_ constants such as
+ *   Socket::SOL_SOCKET, or a protocol level.
+ *   A string or symbol of the name, possibly without prefix, is also
+ *   accepted.
+ * * +optname+ is an integer, usually one of the SO_ constants, such
+ *   as Socket::SO_REUSEADDR.
+ *   A string or symbol of the name, possibly without prefix, is also
+ *   accepted.
+ * * +optval+ is the value of the option, it is passed to the underlying
+ *   setsockopt() as a pointer to a certain number of bytes. How this is
+ *   done depends on the type:
+ *   - Fixnum: value is assigned to an int, and a pointer to the int is
+ *     passed, with length of sizeof(int).
+ *   - true or false: 1 or 0 (respectively) is assigned to an int, and the
+ *     int is passed as for a Fixnum. Note that +false+ must be passed,
+ *     not +nil+.
+ *   - String: the string's data and length is passed to the socket.
+ * * +socketoption+ is an instance of Socket::Option
+ *
+ * === Examples
+ *
+ * Some socket options are integers with boolean values, in this case
+ * #setsockopt could be called like this:
+ *   sock.setsockopt(:SOCKET, :REUSEADDR, true)
+ *   sock.setsockopt(Socket::SOL_SOCKET,Socket::SO_REUSEADDR, true)
+ *   sock.setsockopt(Socket::Option.bool(:INET, :SOCKET, :REUSEADDR, true))
+ *
+ * Some socket options are integers with numeric values, in this case
+ * #setsockopt could be called like this:
+ *   sock.setsockopt(:IP, :TTL, 255)
+ *   sock.setsockopt(Socket::IPPROTO_IP, Socket::IP_TTL, 255)
+ *   sock.setsockopt(Socket::Option.int(:INET, :IP, :TTL, 255))
+ *
+ * Option values may be structs. Passing them can be complex as it involves
+ * examining your system headers to determine the correct definition. An
+ * example is an +ip_mreq+, which may be defined in your system headers as:
+ *   struct ip_mreq {
+ *     struct  in_addr imr_multiaddr;
+ *     struct  in_addr imr_interface;
+ *   };
+ *
+ * In this case #setsockopt could be called like this:
+ *   optval = IPAddr.new("224.0.0.251").hton +
+ *            IPAddr.new(Socket::INADDR_ANY, Socket::AF_INET).hton
+ *   sock.setsockopt(Socket::IPPROTO_IP, Socket::IP_ADD_MEMBERSHIP, optval)
+ *
+*/
+static VALUE
+bsock_setsockopt(int argc, VALUE *argv, VALUE sock)
+{
+    VALUE lev, optname, val;
+    int family, level, option;
+    rb_io_t *fptr;
+    int i;
+    char *v;
+    int vlen;
+
+    if (argc == 1) {
+        lev = rb_funcall(argv[0], rb_intern("level"), 0);
+        optname = rb_funcall(argv[0], rb_intern("optname"), 0);
+        val = rb_funcall(argv[0], rb_intern("data"), 0);
+    }
+    else {
+        rb_scan_args(argc, argv, "30", &lev, &optname, &val);
+    }
+
+    rb_secure(2);
+    GetOpenFile(sock, fptr);
+    family = rsock_getfamily(fptr->fd);
+    level = rsock_level_arg(family, lev);
+    option = rsock_optname_arg(family, level, optname);
+
+    switch (TYPE(val)) {
+      case T_FIXNUM:
+	i = FIX2INT(val);
+	goto numval;
+      case T_FALSE:
+	i = 0;
+	goto numval;
+      case T_TRUE:
+	i = 1;
+      numval:
+	v = (char*)&i; vlen = (int)sizeof(i);
+	break;
+      default:
+	StringValue(val);
+	v = RSTRING_PTR(val);
+	vlen = RSTRING_SOCKLEN(val);
+	break;
+    }
+
+    rb_io_check_closed(fptr);
+    if (setsockopt(fptr->fd, level, option, v, vlen) < 0)
+        rsock_sys_fail_path("setsockopt(2)", fptr->pathv);
+
+    return INT2FIX(0);
+}
+
+#if !defined(__BEOS__)
+/*
+ * Document-method: getsockopt
+ * call-seq:
+ *   getsockopt(level, optname) => socketoption
+ *
+ * Gets a socket option. These are protocol and system specific, see your
+ * local system documentation for details. The option is returned as
+ * a Socket::Option object.
+ *
+ * === Parameters
+ * * +level+ is an integer, usually one of the SOL_ constants such as
+ *   Socket::SOL_SOCKET, or a protocol level.
+ *   A string or symbol of the name, possibly without prefix, is also
+ *   accepted.
+ * * +optname+ is an integer, usually one of the SO_ constants, such
+ *   as Socket::SO_REUSEADDR.
+ *   A string or symbol of the name, possibly without prefix, is also
+ *   accepted.
+ *
+ * === Examples
+ *
+ * Some socket options are integers with boolean values, in this case
+ * #getsockopt could be called like this:
+ *
+ *   reuseaddr = sock.getsockopt(:SOCKET, :REUSEADDR).bool
+ *
+ *   optval = sock.getsockopt(Socket::SOL_SOCKET,Socket::SO_REUSEADDR)
+ *   optval = optval.unpack "i"
+ *   reuseaddr = optval[0] == 0 ? false : true
+ *
+ * Some socket options are integers with numeric values, in this case
+ * #getsockopt could be called like this:
+ *
+ *   ipttl = sock.getsockopt(:IP, :TTL).int
+ *
+ *   optval = sock.getsockopt(Socket::IPPROTO_IP, Socket::IP_TTL)
+ *   ipttl = optval.unpack("i")[0]
+ *
+ * Option values may be structs. Decoding them can be complex as it involves
+ * examining your system headers to determine the correct definition. An
+ * example is a +struct linger+, which may be defined in your system headers
+ * as:
+ *   struct linger {
+ *     int l_onoff;
+ *     int l_linger;
+ *   };
+ *
+ * In this case #getsockopt could be called like this:
+ *
+ *   # Socket::Option knows linger structure.
+ *   onoff, linger = sock.getsockopt(:SOCKET, :LINGER).linger
+ *
+ *   optval =  sock.getsockopt(Socket::SOL_SOCKET, Socket::SO_LINGER)
+ *   onoff, linger = optval.unpack "ii"
+ *   onoff = onoff == 0 ? false : true
+*/
+static VALUE
+bsock_getsockopt(VALUE sock, VALUE lev, VALUE optname)
+{
+    int level, option;
+    socklen_t len;
+    char *buf;
+    rb_io_t *fptr;
+    int family;
+
+    GetOpenFile(sock, fptr);
+    family = rsock_getfamily(fptr->fd);
+    level = rsock_level_arg(family, lev);
+    option = rsock_optname_arg(family, level, optname);
+    len = 256;
+    buf = ALLOCA_N(char,len);
+
+    rb_io_check_closed(fptr);
+
+    if (getsockopt(fptr->fd, level, option, buf, &len) < 0)
+	rsock_sys_fail_path("getsockopt(2)", fptr->pathv);
+
+    return rsock_sockopt_new(family, level, option, rb_str_new(buf, len));
+}
+#else
+#define bsock_getsockopt rb_f_notimplement
+#endif
+
+/*
+ * call-seq:
+ *   basicsocket.getsockname => sockaddr
+ *
+ * Returns the local address of the socket as a sockaddr string.
+ *
+ *   TCPServer.open("127.0.0.1", 15120) {|serv|
+ *     p serv.getsockname #=> "\x02\x00;\x10\x7F\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00"
+ *   }
+ *
+ * If Addrinfo object is preferred over the binary string,
+ * use BasicSocket#local_address.
+ */
+static VALUE
+bsock_getsockname(VALUE sock)
+{
+    union_sockaddr buf;
+    socklen_t len = (socklen_t)sizeof buf;
+    socklen_t len0 = len;
+    rb_io_t *fptr;
+
+    GetOpenFile(sock, fptr);
+    if (getsockname(fptr->fd, &buf.addr, &len) < 0)
+	rb_sys_fail("getsockname(2)");
+    if (len0 < len) len = len0;
+    return rb_str_new((char*)&buf, len);
+}
+
+/*
+ * call-seq:
+ *   basicsocket.getpeername => sockaddr
+ *
+ * Returns the remote address of the socket as a sockaddr string.
+ *
+ *   TCPServer.open("127.0.0.1", 1440) {|serv|
+ *     c = TCPSocket.new("127.0.0.1", 1440)
+ *     s = serv.accept
+ *     p s.getpeername #=> "\x02\x00\x82u\x7F\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00"
+ *   }
+ *
+ * If Addrinfo object is preferred over the binary string,
+ * use BasicSocket#remote_address.
+ *
+ */
+static VALUE
+bsock_getpeername(VALUE sock)
+{
+    union_sockaddr buf;
+    socklen_t len = (socklen_t)sizeof buf;
+    socklen_t len0 = len;
+    rb_io_t *fptr;
+
+    GetOpenFile(sock, fptr);
+    if (getpeername(fptr->fd, &buf.addr, &len) < 0)
+	rb_sys_fail("getpeername(2)");
+    if (len0 < len) len = len0;
+    return rb_str_new((char*)&buf, len);
+}
+
+#if defined(HAVE_GETPEEREID) || defined(SO_PEERCRED) || defined(HAVE_GETPEERUCRED)
+/*
+ * call-seq:
+ *   basicsocket.getpeereid => [euid, egid]
+ *
+ * Returns the user and group on the peer of the UNIX socket.
+ * The result is a two element array which contains the effective uid and the effective gid.
+ *
+ *   Socket.unix_server_loop("/tmp/sock") {|s|
+ *     begin
+ *       euid, egid = s.getpeereid
+ *
+ *       # Check the connected client is myself or not.
+ *       next if euid != Process.uid
+ *
+ *       # do something about my resource.
+ *
+ *     ensure
+ *       s.close
+ *     end
+ *   }
+ *
+ */
+static VALUE
+bsock_getpeereid(VALUE self)
+{
+#if defined(HAVE_GETPEEREID)
+    rb_io_t *fptr;
+    uid_t euid;
+    gid_t egid;
+    GetOpenFile(self, fptr);
+    if (getpeereid(fptr->fd, &euid, &egid) == -1)
+	rb_sys_fail("getpeereid(3)");
+    return rb_assoc_new(UIDT2NUM(euid), GIDT2NUM(egid));
+#elif defined(SO_PEERCRED) /* GNU/Linux */
+    rb_io_t *fptr;
+    struct ucred cred;
+    socklen_t len = sizeof(cred);
+    GetOpenFile(self, fptr);
+    if (getsockopt(fptr->fd, SOL_SOCKET, SO_PEERCRED, &cred, &len) == -1)
+	rb_sys_fail("getsockopt(SO_PEERCRED)");
+    return rb_assoc_new(UIDT2NUM(cred.uid), GIDT2NUM(cred.gid));
+#elif defined(HAVE_GETPEERUCRED) /* Solaris */
+    rb_io_t *fptr;
+    ucred_t *uc = NULL;
+    VALUE ret;
+    GetOpenFile(self, fptr);
+    if (getpeerucred(fptr->fd, &uc) == -1)
+	rb_sys_fail("getpeerucred(3C)");
+    ret = rb_assoc_new(UIDT2NUM(ucred_geteuid(uc)), GIDT2NUM(ucred_getegid(uc)));
+    ucred_free(uc);
+    return ret;
+#endif
+}
+#else
+#define bsock_getpeereid rb_f_notimplement
+#endif
+
+/*
+ * call-seq:
+ *   bsock.local_address => addrinfo
+ *
+ * Returns an Addrinfo object for local address obtained by getsockname.
+ *
+ * Note that addrinfo.protocol is filled by 0.
+ *
+ *   TCPSocket.open("www.ruby-lang.org", 80) {|s|
+ *     p s.local_address #=> #<Addrinfo: 192.168.0.129:36873 TCP>
+ *   }
+ *
+ *   TCPServer.open("127.0.0.1", 1512) {|serv|
+ *     p serv.local_address #=> #<Addrinfo: 127.0.0.1:1512 TCP>
+ *   }
+ *
+ */
+static VALUE
+bsock_local_address(VALUE sock)
+{
+    union_sockaddr buf;
+    socklen_t len = (socklen_t)sizeof buf;
+    socklen_t len0 = len;
+    rb_io_t *fptr;
+
+    GetOpenFile(sock, fptr);
+    if (getsockname(fptr->fd, &buf.addr, &len) < 0)
+	rb_sys_fail("getsockname(2)");
+    if (len0 < len) len = len0;
+    return rsock_fd_socket_addrinfo(fptr->fd, &buf.addr, len);
+}
+
+/*
+ * call-seq:
+ *   bsock.remote_address => addrinfo
+ *
+ * Returns an Addrinfo object for remote address obtained by getpeername.
+ *
+ * Note that addrinfo.protocol is filled by 0.
+ *
+ *   TCPSocket.open("www.ruby-lang.org", 80) {|s|
+ *     p s.remote_address #=> #<Addrinfo: 221.186.184.68:80 TCP>
+ *   }
+ *
+ *   TCPServer.open("127.0.0.1", 1728) {|serv|
+ *     c = TCPSocket.new("127.0.0.1", 1728)
+ *     s = serv.accept
+ *     p s.remote_address #=> #<Addrinfo: 127.0.0.1:36504 TCP>
+ *   }
+ *
+ */
+static VALUE
+bsock_remote_address(VALUE sock)
+{
+    union_sockaddr buf;
+    socklen_t len = (socklen_t)sizeof buf;
+    socklen_t len0 = len;
+    rb_io_t *fptr;
+
+    GetOpenFile(sock, fptr);
+    if (getpeername(fptr->fd, &buf.addr, &len) < 0)
+	rb_sys_fail("getpeername(2)");
+    if (len0 < len) len = len0;
+    return rsock_fd_socket_addrinfo(fptr->fd, &buf.addr, len);
+}
+
+/*
+ * call-seq:
+ *   basicsocket.send(mesg, flags [, dest_sockaddr]) => numbytes_sent
+ *
+ * send _mesg_ via _basicsocket_.
+ *
+ * _mesg_ should be a string.
+ *
+ * _flags_ should be a bitwise OR of Socket::MSG_* constants.
+ *
+ * _dest_sockaddr_ should be a packed sockaddr string or an addrinfo.
+ *
+ *   TCPSocket.open("localhost", 80) {|s|
+ *     s.send "GET / HTTP/1.0\r\n\r\n", 0
+ *     p s.read
+ *   }
+ */
+VALUE
+rsock_bsock_send(int argc, VALUE *argv, VALUE sock)
+{
+    struct rsock_send_arg arg;
+    VALUE flags, to;
+    rb_io_t *fptr;
+    int n;
+    rb_blocking_function_t *func;
+
+    rb_scan_args(argc, argv, "21", &arg.mesg, &flags, &to);
+
+    StringValue(arg.mesg);
+    if (!NIL_P(to)) {
+	SockAddrStringValue(to);
+	to = rb_str_new4(to);
+	arg.to = (struct sockaddr *)RSTRING_PTR(to);
+	arg.tolen = RSTRING_SOCKLEN(to);
+	func = rsock_sendto_blocking;
+    }
+    else {
+	func = rsock_send_blocking;
+    }
+    GetOpenFile(sock, fptr);
+    arg.fd = fptr->fd;
+    arg.flags = NUM2INT(flags);
+    while (rsock_maybe_fd_writable(arg.fd),
+	   (n = (int)BLOCKING_REGION_FD(func, &arg)) < 0) {
+	if (rb_io_wait_writable(arg.fd)) {
+	    continue;
+	}
+	rb_sys_fail("send(2)");
+    }
+    return INT2FIX(n);
+}
+
+/*
+ * call-seq:
+ *   basicsocket.do_not_reverse_lookup => true or false
+ *
+ * Gets the do_not_reverse_lookup flag of _basicsocket_.
+ *
+ *   TCPSocket.open("www.ruby-lang.org", 80) {|sock|
+ *     p sock.do_not_reverse_lookup      #=> false
+ *     p sock.peeraddr                   #=> ["AF_INET", 80, "carbon.ruby-lang.org", "221.186.184.68"]
+ *     sock.do_not_reverse_lookup = true
+ *     p sock.peeraddr                   #=> ["AF_INET", 80, "221.186.184.68", "221.186.184.68"]
+ *   }
+ */
+static VALUE
+bsock_do_not_reverse_lookup(VALUE sock)
+{
+    rb_io_t *fptr;
+
+    GetOpenFile(sock, fptr);
+    return (fptr->mode & FMODE_NOREVLOOKUP) ? Qtrue : Qfalse;
+}
+
+/*
+ * call-seq:
+ *   basicsocket.do_not_reverse_lookup = bool
+ *
+ * Sets the do_not_reverse_lookup flag of _basicsocket_.
+ *
+ *   BasicSocket.do_not_reverse_lookup = false
+ *   p TCPSocket.new("127.0.0.1", 80).do_not_reverse_lookup #=> false
+ *   BasicSocket.do_not_reverse_lookup = true
+ *   p TCPSocket.new("127.0.0.1", 80).do_not_reverse_lookup #=> true
+ *
+ */
+static VALUE
+bsock_do_not_reverse_lookup_set(VALUE sock, VALUE state)
+{
+    rb_io_t *fptr;
+
+    GetOpenFile(sock, fptr);
+    if (RTEST(state)) {
+	fptr->mode |= FMODE_NOREVLOOKUP;
+    }
+    else {
+	fptr->mode &= ~FMODE_NOREVLOOKUP;
+    }
+    return sock;
+}
+
+/*
+ * call-seq:
+ *   basicsocket.recv(maxlen) => mesg
+ *   basicsocket.recv(maxlen, flags) => mesg
+ *
+ * Receives a message.
+ *
+ * _maxlen_ is the maximum number of bytes to receive.
+ *
+ * _flags_ should be a bitwise OR of Socket::MSG_* constants.
+ *
+ *   UNIXSocket.pair {|s1, s2|
+ *     s1.puts "Hello World"
+ *     p s2.recv(4)                     #=> "Hell"
+ *     p s2.recv(4, Socket::MSG_PEEK)   #=> "o Wo"
+ *     p s2.recv(4)                     #=> "o Wo"
+ *     p s2.recv(10)                    #=> "rld\n"
+ *   }
+ */
+static VALUE
+bsock_recv(int argc, VALUE *argv, VALUE sock)
+{
+    return rsock_s_recvfrom(sock, argc, argv, RECV_RECV);
+}
+
+/*
+ * call-seq:
+ * 	basicsocket.recv_nonblock(maxlen) => mesg
+ * 	basicsocket.recv_nonblock(maxlen, flags) => mesg
+ *
+ * Receives up to _maxlen_ bytes from +socket+ using recvfrom(2) after
+ * O_NONBLOCK is set for the underlying file descriptor.
+ * _flags_ is zero or more of the +MSG_+ options.
+ * The result, _mesg_, is the data received.
+ *
+ * When recvfrom(2) returns 0, Socket#recv_nonblock returns
+ * an empty string as data.
+ * The meaning depends on the socket: EOF on TCP, empty packet on UDP, etc.
+ *
+ * === Parameters
+ * * +maxlen+ - the number of bytes to receive from the socket
+ * * +flags+ - zero or more of the +MSG_+ options
+ *
+ * === Example
+ * 	serv = TCPServer.new("127.0.0.1", 0)
+ * 	af, port, host, addr = serv.addr
+ * 	c = TCPSocket.new(addr, port)
+ * 	s = serv.accept
+ * 	c.send "aaa", 0
+ * 	begin # emulate blocking recv.
+ * 	  p s.recv_nonblock(10) #=> "aaa"
+ * 	rescue IO::WaitReadable
+ * 	  IO.select([s])
+ * 	  retry
+ * 	end
+ *
+ * Refer to Socket#recvfrom for the exceptions that may be thrown if the call
+ * to _recv_nonblock_ fails.
+ *
+ * BasicSocket#recv_nonblock may raise any error corresponding to recvfrom(2) failure,
+ * including Errno::EWOULDBLOCK.
+ *
+ * If the exception is Errno::EWOULDBLOCK or Errno::AGAIN,
+ * it is extended by IO::WaitReadable.
+ * So IO::WaitReadable can be used to rescue the exceptions for retrying recv_nonblock.
+ *
+ * === See
+ * * Socket#recvfrom
+ */
+
+static VALUE
+bsock_recv_nonblock(int argc, VALUE *argv, VALUE sock)
+{
+    return rsock_s_recvfrom_nonblock(sock, argc, argv, RECV_RECV);
+}
+
+/*
+ * call-seq:
+ *   BasicSocket.do_not_reverse_lookup => true or false
+ *
+ * Gets the global do_not_reverse_lookup flag.
+ *
+ *   BasicSocket.do_not_reverse_lookup  #=> false
+ */
+static VALUE
+bsock_do_not_rev_lookup(void)
+{
+    return rsock_do_not_reverse_lookup?Qtrue:Qfalse;
+}
+
+/*
+ * call-seq:
+ *   BasicSocket.do_not_reverse_lookup = bool
+ *
+ * Sets the global do_not_reverse_lookup flag.
+ *
+ * The flag is used for initial value of do_not_reverse_lookup for each socket.
+ *
+ *   s1 = TCPSocket.new("localhost", 80)
+ *   p s1.do_not_reverse_lookup                 #=> true
+ *   BasicSocket.do_not_reverse_lookup = false
+ *   s2 = TCPSocket.new("localhost", 80)
+ *   p s2.do_not_reverse_lookup                 #=> false
+ *   p s1.do_not_reverse_lookup                 #=> true
+ *
+ */
+static VALUE
+bsock_do_not_rev_lookup_set(VALUE self, VALUE val)
+{
+    rsock_do_not_reverse_lookup = RTEST(val);
+    return val;
+}
+
+void
+rsock_init_basicsocket(void)
+{
+    /*
+     * Document-class: BasicSocket < IO
+     *
+     * BasicSocket is the super class for all the Socket classes.
+     */
+    rb_cBasicSocket = rb_define_class("BasicSocket", rb_cIO);
+    rb_undef_method(rb_cBasicSocket, "initialize");
+
+    rb_define_singleton_method(rb_cBasicSocket, "do_not_reverse_lookup",
+			       bsock_do_not_rev_lookup, 0);
+    rb_define_singleton_method(rb_cBasicSocket, "do_not_reverse_lookup=",
+			       bsock_do_not_rev_lookup_set, 1);
+    rb_define_singleton_method(rb_cBasicSocket, "for_fd", bsock_s_for_fd, 1);
+
+    rb_define_method(rb_cBasicSocket, "close_read", bsock_close_read, 0);
+    rb_define_method(rb_cBasicSocket, "close_write", bsock_close_write, 0);
+    rb_define_method(rb_cBasicSocket, "shutdown", bsock_shutdown, -1);
+    rb_define_method(rb_cBasicSocket, "setsockopt", bsock_setsockopt, -1);
+    rb_define_method(rb_cBasicSocket, "getsockopt", bsock_getsockopt, 2);
+    rb_define_method(rb_cBasicSocket, "getsockname", bsock_getsockname, 0);
+    rb_define_method(rb_cBasicSocket, "getpeername", bsock_getpeername, 0);
+    rb_define_method(rb_cBasicSocket, "getpeereid", bsock_getpeereid, 0);
+    rb_define_method(rb_cBasicSocket, "local_address", bsock_local_address, 0);
+    rb_define_method(rb_cBasicSocket, "remote_address", bsock_remote_address, 0);
+    rb_define_method(rb_cBasicSocket, "send", rsock_bsock_send, -1);
+    rb_define_method(rb_cBasicSocket, "recv", bsock_recv, -1);
+    rb_define_method(rb_cBasicSocket, "recv_nonblock", bsock_recv_nonblock, -1);
+    rb_define_method(rb_cBasicSocket, "do_not_reverse_lookup", bsock_do_not_reverse_lookup, 0);
+    rb_define_method(rb_cBasicSocket, "do_not_reverse_lookup=", bsock_do_not_reverse_lookup_set, 1);
+
+    rb_define_method(rb_cBasicSocket, "sendmsg", rsock_bsock_sendmsg, -1); /* in ancdata.c */
+    rb_define_method(rb_cBasicSocket, "sendmsg_nonblock", rsock_bsock_sendmsg_nonblock, -1); /* in ancdata.c */
+    rb_define_method(rb_cBasicSocket, "recvmsg", rsock_bsock_recvmsg, -1); /* in ancdata.c */
+    rb_define_method(rb_cBasicSocket, "recvmsg_nonblock", rsock_bsock_recvmsg_nonblock, -1); /* in ancdata.c */
+
+}